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Question

Boxes A, B and C contain 360g of sand altogether. 1/6 of sand in Box A is poured into Box B. 1/3 of sand in Box B is poured into Box C. 1/5 of sand in Box C is poured into Box A. There was an equal amount of sand in each box in the end. Find the amount of sand in each box at first.

Answer

A :  108g

B : 162g

C: 90g

Try to work backwards, I will give you the first sentence  example,

1/5 of sand in Box C is poured into Box A. So you must find Box C initial weight before pouring into Box A. And you know that Box A, B, C is equal weight which is 120g.

Box C weight before pouring into box A x 4/5 = 120g

Box C weight before pouring into box A = 120 x 5/4 = 150g

After which you have to minus 30 g from box A. 

After you solve Box A and C, you can continue to the next 2 sentences. using the method I gave on top.

Hope it help!!

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